Investigator

Anirut Watcharawipha

Assistant Professor · Chiang Mai University, Radiology, Faculty of Medicine

AWAnirut Watcharawi…
Papers(1)
Improvement of treatm…
Collaborators(1)
Wannapha Nobnop
Institutions(1)
Chiang Mai University

Papers

Improvement of treatment plan quality with modified fixed field volumetric modulated arc therapy in cervical cancer

AbstractPurposeThis study aims to introduce modified fixed field volumetric modulated arc therapy (MF‐VMAT) which manually opened the field size by fixing the jaws and comparing it to the typical planning technique, auto field volumetric modulated arc therapy (AF‐VMAT) in cervical cancer treatment planning.Methods and materialsPreviously treated twenty‐eight cervical cancer plans were retrospectively randomly selected and replanned in this study using two different planning techniques: AF‐VMAT and MF‐VMAT, resulting in a total of fifty‐six treatment plans. In this study, we compared both planning techniques in three parts: (1) Organ at Risk (OARs) and whole‐body dose, (2) Treatment plan efficiency, and (3) Treatment plan accuracy.ResultsFor OARs dose, bowel bag (p‐value = 0.001), rectum (p‐value = 0.002), and left femoral head (p‐value = 0.001) and whole‐body (p‐value = 0.000) received a statistically significant dose reduction when using the MF‐VMAT plan. Regarding plan efficiency, MF‐VMAT exhibited a statistically significant increase in both number of monitor units (MUs) and control points (p‐values = 0.000), while beam‐on time, maximum leaf travel, average maximum leaf travel, and maximum leaf travel per gantry rotation were statistically significant decreased (p‐values = 0.000). In terms of plan accuracy, the average gamma passing rate was higher in the MF‐VMAT plan for both absolute dose (AD) (p‐value = 0.001, 0.004) and relative dose (RD) (p‐value = 0.000, 0.000) for 3%/3 and 3%/2 mm gamma criteria, respectively.ConclusionThe MF‐VMAT planning technique significantly reduces OAR doses and decreases the spread of low doses to normal tissues in cervical cancer patients. Additionally, this planning approach demonstrates efficient plans with lower beam‐on time and reduced maximum leaf travel. Furthermore, it indicates higher plan accuracy through an increase in the average gamma passing rate compared to the AF‐VMAT plan. Consequently, MF‐VMAT offers an effective treatment planning technique for cervical cancer patients.

28Works
1Papers
1Collaborators
Nasopharyngeal NeoplasmsUterine Cervical NeoplasmsPrognosisLiver Neoplasms

Positions

2022–

Assistant Professor

Chiang Mai University · Radiology, Faculty of Medicine

2020–

Instructor

Chiang Mai University · Radiology, Faculty of Medicine

2013–

Medical Physicist

Chiang Mai University · Radiology

2001–

Radiation dosimetrist

Chiang Mai University · Radiology

2001–

Radiographer

Jularat 9 Hospital · Radiology

Education

2020

Ph.D.(Biomedical Engineering)

Chiang Mai University

2009

M.Sc. (Medical Physics)

Chiang Mai University

1999

B.Sc. (Radiation Technology)

Mahidol University · Medical technology

Country

TH